        body {
            margin: 0;
        }
        
        .left {
            float: left;
        }
        
        .right {
            float: right;
        }
        
        .header {
            margin: 0 auto;
            width: 400px;
            height: 100px;
        }
        
        .content .menu {
            position: fixed;
            top: 87px;
            left: 0;
            bottom: 0;
            width: 100px;
        }
        
        .content .content {
            position: fixed;
            top: 100px;
            right: 0;
            bottom: 0;
            left: 100px;
            overflow: auto;
        }
        
        .title {
            margin: 0 auto;
            width: 400px;
            height: 100px;
        }
        
        #nav li {
            float: left;
        }
        
        #menu-left {
            border: 1px;
        }